BC1 Small Format Broadcast Consoles
Mono Input Module
The 4 Band Equalizer combines two fully parametric mid band with a soft bell low band and a high equalizer that can be switched from shelving mode to soft bell mode bei the 20 k / 10 k switch. The Hi band defaults to a shelving characteristic with boost or cut of 20 dB @ 20 kHz. Pressing the 10 k switch selects a very soft bell characteristic that has it's maximum @ 10 kHz and the - 3 dB points at 4 kHz and 25 kHz. While the default mode is optimized to produced soft, silky high frequencies, the 10 k setting can produce or reduce pressure at the upper end of the audio band.
The Low EQ operates always in soft bell mode with a fixed Q factor of 0.5, which comes very close to a conventional baxandall characteristic but avoids the boost of subsonic interferences while boosting the low range. In most cases it not necessary to prevent subsonic gain with the high-pass filter, when using this low EQ with high gain setting. The center frequencies are 60 Hz by default and 120 Hz when the corresponding switch is pressed. Like all bands, the low band has a boost / cut range of 20 dB.
The two Mid EQ's cover the frequency range from 60 Hz to 20 kHz. The sweep range of MID1 reaches from 60 Hz up to 4 kHz while the MID2 band has a sweep range from 250 Hz to 20 kHz. The wide range of the Q factor control is from 3 octaves in the 'wide' position down to a third, if the pot is set all to the right. In combination with the wide sweep ranges and the 20 dB range for boost ad cut, these EQ's cover all application very well.
All gain controls pots have center detents. The EQ design uses adt-audio's active Vienna Bridge principle for best possible sound performance, phase response and dynamic range. The EQ switch inserts the equalizer.
The Insert Section is fully buffered and balanced. It operates on nominal level and input and output can handle levels of + 30 dBu. The output signal is always available on the connector panel. The insert input signal is switched into the channels signal flow when the INS switch is pressed.
The Insert Section is post EQ; however, the PRE switch reverses EQ and insert.
The Channel Fader is a 100 mm conductive plastic fader, brand Ko-On, Japan, with a maximum gain of 10 dB. The cut off attenuation is more than 100 dB. The fader circuit includes the CUT switch that mutes the fader output independent of the fader position. The Cut function can also be controlled by the 2 Cut Groups, A and B. Single switches per group next to the fader enable the cut groups for the particular channel. The PFL function includes the commonly required functions. Depending on local jumper settings and the central status selection, PFL operates in adding or single mode. With adding mode, any number of active PFL's are mixed while with single mode, the activation of a PFL resets all other PFL switches. With the standard setting that can be modified per channel PFL latches if the fader is closed. PFL resets automatically when the fader is opened. With fader open non-latched PFL is still possible.